question_answer

Which of the following pairs are correctly matched?

[a] Primary sex ratio: Sex at the time of conception

[b] Secondary sex ratio: Sex at the time of enumeration

[c] Tertiary sex ratio: Sex at the time of enumeration

[d] lam balanced sex ratio: Sex of workers

Select the correct answer using the codes given below

A)  1, 2, 3 and 4                            

B)  1, 3 and 4

C)  2 and 4     

D)  1, 2 and 3